Optical Illusions 21

Optical Illusions

by Gianni A. Sarcone and Marie J. Waeber

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Geometric Illusions 21


	Observe the diagram opposite. Are the grey shapes perfect squares? Are the sides of the black quadrilaterals straight? Do they have pointed corners?
Optical Effects with Squares
			Are all the grey squares the same shade?
	With the same square composition (with and without outlines) we can obtain 2 shade effects
	sheen effect (the squares seem to stand out against the background)
		halo effect

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